Mild street build heads

[c00nhunterjoe]

if i recall the sealed powers are sitting down in the hole pretty good. probably 8.5-9:1 if you are lucky. bone stock cam? hmm... if you can really yank some gears i would give you a mid 13 to maybe a 13.8 @ 102. thats still going to be respectable for a 45 year old 2 ton machine. i say take it to the track and see what she does! 

[rt green]

so, sitting down about say  10 thousands or so?  or more? I wish I could tell you the number, but I cant. the Bob K cam. he says he's done years of testing on six packs, and this was the best grind he's come up with. I hope I don't have to change pistons, but I will if I have to.

[c00nhunterjoe]

Honestly, if it runs good and isnt smoking,, I would take it to the track and see what she does. If you are happy with it then great. If not, then think about tearing it down to make it faster.

[heyoldguy]

I know the Edelbrock heads are wildly popular for all kinds of rebuild and I know a good performance refurb on a set of used heads can cost as much as aluminum ones.  But for a mild street build aren't the iron heads still just fine?  Or are they still the choke point and anything more than a bone stock cam is going to show that?  I'm talking about a close to stock engine with manifolds.

Well we dyno'd the 7.515:1 compression 400 with 346 factory iron heads, 2.14/1.81 valves. Summit 6400 cam 214/224 @ .050 .444/.466 lift and the dyno headers.

Heads flowed,

.100"............85 cfm int/58 cfm exh
.200.....................164/120
.300.....................217/168
.400.....................234/198
.500.....................253/212

With the stock 2bbl carb and intake it made 371 lb-ft @ 2900 rpm and 285 hp @ 4700 rpm.

So for the fun of it we installed a Holley Street Dominator and a Q950 and made two more pulls. 399 lb-ft @ 3400 rpm to 396 lb-ft @ 4400 rpm with a peak of 403 lb-ft @ 3900 rpm. 361 HP @ 5100 rpm.

Don't know if this will answer any of your questions or muddy the waters further still.

[Ghoste]

Haha, a little of both.

[heyoldguy]

So I guess you didn't see this where we swapped a 509 cam into a 440 with stock 906 heads and then changed to mildly ported 516 heads?

http://www.dodgecharger.com/forum/index.php/topic,104749.0.html

[Ghoste]

I did, I read all of those.

[firefighter3931]

Heads flowed,

.100"............85 cfm int/58 cfm exh
.200.....................164/120
.300.....................217/168
.400.....................234/198
.500.....................253/212

That's pretty close to what an out of the box Stealth head flows. Those are nice numbers for a 516 casting which are known to be weak 

What would a set of those cost with new seats, valves, guides, springs, retainers, locks and the required portwork ?  I'm guessing well north of a set of Stealth heads ? 



Ron

[heyoldguy]

Heads flowed,

.100"............85 cfm int/58 cfm exh
.200.....................164/120
.300.....................217/168
.400.....................234/198
.500.....................253/212

That's pretty close to what an out of the box Stealth head flows. Those are nice numbers for a 516 casting which are known to be weak 

What would a set of those cost with new seats, valves, guides, springs, retainers, locks and the required portwork ?  I'm guessing well north of a set of Stealth heads ? 



Ron

Those were 346 heads used on the 400. The 516 heads were on the 440. Anyway, the 346 heads would be right at $1,570 at those flow levels.